(1) From Chris Torek -- get the type right after deleting a shift and

(1) From Chris Torek -- get the type right after deleting a shift and
upgrading an indexed address from byte to short or long offsets.  (2) Clean
out trash in regs[r] for r<NREG when updating uses[r] and regs[r] in bflow(),
avoiding amazing substitution of operands.  (3) flops() fix fails if there are
other uses between the store and the last use; we now loop on uses in flops().

SCCS-vsn: old/pcc/c2.tahoe/c21.c 1.9